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The term chemotype specifically refers to the variations in chemical composition that can occur within a single plant species. This is particularly important in the context of essential oils, as different chemotypes can produce oils with significantly different therapeutic properties and aromas. For example, the same species of a plant may yield oils that vary in their major constituents based on factors such as growth conditions, geographical location, or even the specific part of the plant being harvested. Understanding chemotypes is essential for aromatherapy practitioners, as it ensures they select the correct essential oil that matches the desired therapeutic effect.

While other options discuss different aspects of essential oils, they do not accurately describe the concept of chemotype. A family of essential oil blends pertains to groupings based on fragrance or usage rather than chemical makeup. A specific fragrance profile is more about aroma characteristics than the underlying chemistry. The geographical origin relates to where the plant is grown, which can influence but does not define the chemical composition variations intrinsic to the plant itself.